/**

Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016.  All rights reserved.

Contact:
     SYSTAP, LLC DBA Blazegraph
     2501 Calvert ST NW #106
     Washington, DC 20008
     licenses@blazegraph.com

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
/*
 * Created on Sep 15, 2007
 */

package com.bigdata.util;

import junit.framework.TestCase;

/**
 * Test suite for {@link HybridTimestampFactory}.
 * 
 * @todo test ctor correct acceptance and correct rejection and internally
 *       computed fields.
 * 
 * @todo test with all legal ctor values for counterBits and plot the #of
 *       distinct timestamps per millisecond as a function of counterBits.
 * 
 * @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
 * @version $Id$
 */
public class TestHybridTimestampFactory extends TestCase {

    /**
     * 
     */
    public TestHybridTimestampFactory() {
        super();
    }

    /**
     * @param arg0
     */
    public TestHybridTimestampFactory(String arg0) {
        super(arg0);
    }

    /**
     * Test verifies that timestamps are always distinct from the last generated
     * timestamp as generated by {@link HybridTimestampFactory#nextMillis()} and
     * notes the actual granularity of the generated timestamps.
     */
    public void test_nextTimestamp2() {

        final int limit = 100000;
        
        HybridTimestampFactory timestampFactory = new HybridTimestampFactory(10);
        
        final long begin = System.currentTimeMillis();

        long lastTimestamp = begin - 1;
        
        long timestamp;
        
        for( int i=0; i<limit; i++ ) {

            timestamp = timestampFactory.nextTimestamp();
            
            if (timestamp == lastTimestamp)
                fail("Same timestamp?");

            if (timestamp < lastTimestamp)
                fail("Time goes backwards?");

            lastTimestamp = timestamp;
            
        }
        
        long elapsed = System.currentTimeMillis() - begin;
        
        System.err.println("Generated " + limit + " timestamps in " + elapsed
                + " milliseconds: ts/ms: " + limit / (double) elapsed);
        
        System.err.println("The #of times the factory invoked Thread.sleep(): "
                + timestampFactory.getSleepCounter());
        
    }
    
}
